Error when plotting a 2-D vector field

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Melissa A.
Melissa A. 2019-3-21
编辑： Melissa A. 2019-3-21
Hello Mathworks Community,
I am trying to plot the electric field vector on matlab , but I am encountering problems. I would like to write the x and why components of the vector field described in the picture below.
When I try to write x component of the vector field i encounter the error mentioned below.
Thank you for your help
>> Nx=100; %number of mesh points on x-axis
>> Ny=100; %number of mesh points on y-axis
>> xrng = linspace (-100,100,Nx);
>> yrng= linspace(0,200,Ny); %specifying the ranges for the x and y axes
>> [X_grd, Y_grd] = meshgrid(xrng,yrng); %2-D grid
>> Eps=8.854*10^-12;
>> E_x=2*(X_grd-2)/k((X_grd-2).^2 +(Y_grd-2).^2).^3/2;
Array indices must be positive integers or logical values.

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